v3.26.1
Related Party Transactions - Summary Of Major Loan Transactions With Related Parties (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
W Service Networks Co., Ltd.      
Reconciliation of changes in finance agreements to related parties [Abstract]      
Beginning balance ₩ 51 [1] ₩ 108 [1] ₩ 120
Changes in finance agreements to related parties [Abstract]      
Loan 403 475 483
Collection 424 532 495
Others 0 0 0
Ending balance [1] 30 51 108
Korea Credit Bureau Co., Ltd.      
Reconciliation of changes in finance agreements to related parties [Abstract]      
Beginning balance 1 [1] 1 [1] 2
Changes in finance agreements to related parties [Abstract]      
Loan 3 3 12
Collection 4 3 13
Others 0 0 0
Ending balance [1] 0 1 1
Korea Finance Security Co., Ltd.      
Reconciliation of changes in finance agreements to related parties [Abstract]      
Beginning balance 3,225 [1] 3,228 [1] 3,433
Changes in finance agreements to related parties [Abstract]      
Loan 2,052 2,705 2,911
Collection 1,842 2,708 3,116
Others 0 0 0
Ending balance [1] 3,435 3,225 3,228
LOTTE CARD Co.,Ltd.      
Reconciliation of changes in finance agreements to related parties [Abstract]      
Beginning balance 27,913 [1] 12,209 [1] 50,000
Changes in finance agreements to related parties [Abstract]      
Loan 12,531 288,794 226,318
Collection 13,213 274,484 264,109
Others (351) 1,394 0
Ending balance [1] 26,880 27,913 12,209
K BANK Co., Ltd.      
Reconciliation of changes in finance agreements to related parties [Abstract]      
Beginning balance 18 [1] 54 [1] 3
Changes in finance agreements to related parties [Abstract]      
Loan 256 317 218
Collection 257 353 167
Others 0 0 0
Ending balance [1] 17 18 54
Win Mortgage Co.,LTd.      
Reconciliation of changes in finance agreements to related parties [Abstract]      
Beginning balance 8 [1] 15  
Changes in finance agreements to related parties [Abstract]      
Loan 250 243  
Collection 240 250  
Others 0 0  
Ending balance 18 [1] 8 [1] 15
ARAM CMC Company Limited      
Reconciliation of changes in finance agreements to related parties [Abstract]      
Beginning balance 41 [1] 41 [1] 0
Changes in finance agreements to related parties [Abstract]      
Loan 0 0 41
Collection 41 0 0
Others 0 0 0
Ending balance [1] 0 41 41
Godo Kaisha Oceanos 1      
Reconciliation of changes in finance agreements to related parties [Abstract]      
Beginning balance 38,770 [1] 38,121 [1] 39,814
Changes in finance agreements to related parties [Abstract]      
Loan 22,921 0 0
Collection 64,002 0 0
Others 2,311 649 (1,693)
Ending balance [1] 0 38,770 38,121
Woori Zip 1      
Reconciliation of changes in finance agreements to related parties [Abstract]      
Beginning balance 0 [1] 11,317 [1] 11,819
Changes in finance agreements to related parties [Abstract]      
Loan   0 0
Collection   11,227 0
Others   (90) (502)
Ending balance [1]   0 11,317
Woori Zip 2      
Reconciliation of changes in finance agreements to related parties [Abstract]      
Beginning balance 0 [1] 16,063 [1] 16,776
Changes in finance agreements to related parties [Abstract]      
Loan   0 0
Collection   15,936 0
Others   (127) (713)
Ending balance [1]   0 16,063
Woori Real Estate Investment No. 1 Limited Liability Company      
Reconciliation of changes in finance agreements to related parties [Abstract]      
Beginning balance 0    
Changes in finance agreements to related parties [Abstract]      
Loan 42,885    
Collection 0    
Others 0    
Ending balance ₩ 42,885 0  
One Mortgage      
Reconciliation of changes in finance agreements to related parties [Abstract]      
Beginning balance   15 [1] 0
Changes in finance agreements to related parties [Abstract]      
Loan     262
Collection     247
Others     0
Ending balance [1]     15
Central Network Solutions Co., Ltd.      
Reconciliation of changes in finance agreements to related parties [Abstract]      
Beginning balance   ₩ 0 [1] 251
Changes in finance agreements to related parties [Abstract]      
Loan     0
Collection     251
Others     0
Ending balance [1]     ₩ 0
[1] Payments that occurred for business reasons among related parties are excluded and net increase or decrease was used for limited credit loan.